This is a hint for my previous question, think about it. Nicol's reply is partially correct but there is further reasoning required in my opinion. Best of luck.
2006-12-30 03:49:29 · 8 answers · asked by rrastogi_1998 1 in Science & Mathematics ➔ Geography
Water expands when it freezes.
2006-12-30 04:20:28 · answer #1 · answered by I don't think so 5 · 0⤊ 2⤋
This is because water is densest at 4 degrees celsius (rather than 0 degrees Celsius). So, this means that when it's cold, the warmer water (at 4 degrees) goes to the bottom, while the colder water (at 0 degrees or so) floats to the top. Therefore, the water freezes from the top of lake (or river) first allowing the warmer water underneath to remain water. The frozen ice than acts as a barrier inhibiting the rest of the water below it.
This is why fish & other life can survive through the winter.
2006-12-30 03:58:47 · answer #2 · answered by Anonymous · 1⤊ 0⤋
The density of water varies with temperature. The maximum density occurs slightly above freezing. The density of water then goes down for temperatures greater than or lower than 4 degrees C.
Thus, as the surrounding temperature begins to fall, first the denset water goes down and the less dense water ( water below 4 deg C) goes up. As ths process builds up and starts forming layers of ice, it acts as heat barrier and doesnot allow the heat that is trapped inside to escape.
This is good for us in that lakes do not freeze solid in the winter killing all life in them.
2006-12-30 05:03:34 · answer #3 · answered by kirti.t 1 · 1⤊ 0⤋
It's maximum density occurs at +4 degrees C, so that the lowest layers of water remain liquid until the cold penetrates so low in the river that it all freezes.
Flowing water seems to need it colder to freeze. I don't know if this is true - it certainly seems that way.
2006-12-30 11:11:40 · answer #4 · answered by rosie recipe 7 · 0⤊ 0⤋
The biggest reason that is mostly neglected was mentioned by kirti. t., that is that ice acts like an insulative layer. You get a 3 ft layer of ice on anything and it insulates pretty well. Look at igloos. I say give the best answer to kirti. t.
2006-12-30 06:27:27 · answer #5 · answered by Angry Marsupial 2 · 0⤊ 0⤋
Okay, I'll guess motion. The water at the bottom is always moving. And, all the ice above it insulates it from further exposure to cold.
2006-12-30 03:55:34 · answer #6 · answered by AK 6 · 0⤊ 0⤋
The specific gravity, relative density. Water is more dense than ice.
2006-12-30 06:03:17 · answer #7 · answered by S. B. 6 · 0⤊ 0⤋
Ice is lighter than water
2006-12-30 06:37:39 · answer #8 · answered by Suhas 2 · 0⤊ 0⤋